swift 这个帮解释下吧

The operator identifier lexer grammar has been revised to simplify the rules
for operators that start with a dot ("."). The new rule is that an operator
that starts with a dot may contain other dots in it, but operators that start
with some other character may not contain dots. For example:

x....foo   --> "x" "...." "foo"
x&%^.foo   --> "x" "&%^"  ".foo"
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